Electromagnetic fuel pump



July 5, 1932. P. s. TICE ELECTROMAGNETIC FUEL PUMP Original Filed Feb. 13,1928 2 Sheets-Sheet 2 jnv'ezafoz" ,Perca VZflflce. f @M/YCM 1/ Patented July 5, 1932 UNITED STATES PATENT OFFICE;

PERCIVAL S. TICE, OF CHICAGO, ILLINOIS, ASSIGNOR 'IO STEWART-WARNER CORPORA- 'IION, OF CHICAGO, ILLINOIS, A. CORPORATION OF VIRGINIA ELECTROMAGNETIC FUEL PUMP Original application filed February 13, 1928, Serial No. 258,974. Divided and this application iiled August This application is a division of my pending application Serial Number 253,974, filed February 13, 1928. The specific purpose of the present invention is to provide an improved construction' of electromagnetic pumping device which is shown in suitable form for pumping fuel to an internal combustion engine. It consists in the elements .and features of construction shown and dew scribed as indicated in the claims.

In the drawings:

Figure 1 is a diagrammatic view showing the installation of the electromagnetic pump for supplying fuel to an internal combustion engine.

Figure 2 is an axial section of the pump structure showing also its connection for liquid-inflow from the liquid source and discharge to the place of use, said place of use being, as shown, the governed level fuel chamber of an engine carbureter.

Figure 3 is a section at the line 3-3 on Figure 2.

Figure 4 is a detail section at the line 44 on Figure 3 on an enlarged scale for showing the alternating switch.

Figure 5 is a wiring diagram for showing the circuit connection with the switch shown in Figure 4.

Figure 6 is a detail section at the line 6-6 on Figure 2.

Figure 7 is a section at the'line 7-7 on Figure 6.

In the embodiment of the invention to becovered by this divisional application, the electromagnetic pumping element comprises an energizing circuit winding, 200, Wound between iron retaining rings or spool heads, 201, 202, upon a hollow core member, 203, whose cavity from one end to a point somewhat past the middle of the length constitutes a piston chamber, 204, in which there is fitted pistonwise an armature element, 205, the remaining portion of said cavity, which is somewhat less than half the axial extent of the encompassing circuit winding, being occupied by a fixed magnet pole piece, 206, to which the armature piston, 205, is attracted when the circuit is closed through 50 the circuit winding, 200. A spring, 205a, is

Serial No. 554,513.

provided reacting on the armature piston for restoring it to normal position, withdrawn from the pole piece, 206, when the circuit is interrupted by the action of the switch to be now described.

At the end of the core member opposite thepole piece, 206, there is mounted a segmental annular insulating plate, 207, which serves to stop the outwardly spring-caused stroke of the armature piston. On said insulating plate, 207, there is mounted a switch lever, 208, pivoted at one end as seen at 209 in Figure 3, on a bracket, 210, mounted fixedly on said insulating plate, 207, and in contact with a binding post, 210a, to which is attached the circuit wire, 211, which leads from the ignition switch seen at M in Figure 5.

Said switch lever extends across the axis of the core member and carries at its free end 70 a roller, 212, which at rest position of the parts, when no current is passing through the magnet circuit winding, and the armature piston is accordingly thrust by the spring, 205a, against the inner side of the insulating plate, 207, rests against the inner side of a double cone boss, 213, of insulating material having a hollow stem, 214, by means of which it is mounted centrally in the armature piston, 205, and cooperates with the pin, 206a, which projects rigidly from the pole piece, 206, into said hollow stem for guiding the armature piston, from which said double cone boss projects past the insulating plate, 207. At this position of the switch lever it is in contact with the contact member, 215, to which is attached the circuit wire forming the circuit winding, 200, whose inner end is grounded in any convenient manner; and in this position of the switch it closes the circuit through said circuit windings for energizing the magnet pole piece. The roller, 212, is journaled in the ends of the two parallel arms 208a, 208a, of the switch lever, 208, and has one of its journal bearings slotted as seen at 2086 Figure 5 to permit the rollerjournaled at its end to vibrate toward and from the double-coned boss, 213; and a stretched spring, 216, connected to that end of the roller journal and at the other end to the bracket, 100

210, operates for holding the roller stressed against the double cone with the efiect that when the armature piston is pulled lnward by the attraction of the pole piece upon the closing of the circuit through the ignition s-wltch by the governing switch, not shown, energizing the circuit winding, 200, the roller belng crowded out to the apex of the double cone is retracted on the outer cone slope and the switch lever, 208, is thus swung over to C11- cuit-breaking position where it is stopped against the insulating plate, 207.

Thereupon the spring, 205a, retracts the armature piston to the initial position causing opposite action of the cooperating double cone and roller, i. e., swinging the switch lever back to the circuit-closing position; and thus.

the armature piston is reciprocated rapidly so long as the circuit is closed through the governing switch and interrupted only by the alternating switch above described.

The electromagnetic pumping device thus far described is fitted snugly in a cylindrical cavity of the casing, 220, with one open end of which the pumping device is flush, the ,cavity of the casing being counterbored the length over-all of the pumping device, leaving at the inner end of the cylindrical cavity a chamber, 221, in which the alternating switch device above described is situated. The casing, 220, has an exteriorly projecting hollow boss, 222, afiording a duct, 222*, said boss and duct extending the entire height of the casing at the side at which the chamber, 221, is situated, and extending also around the lower right-hand corner and along the side of the casing, as seen at 223, and open at the end at which the pumping device is flush with the casing as above mentioned.

At the upper side the casing has a hollow boss, 224, aflording a duct, 224*, open at the same end as the duct, 222", of the boss, 222. A port, 225, aflords communication of the chamber, 221, with the duct, 222 at the upper end of the latter; and below that port there is interposed in the duct, 222", a check valve, 226, open for fluid flow toward the port, 225, and thereby into the chamber, 221; and from the upper side of that chamber a port, 227, controlled by a check valve, 228, afi'ords communication with the duct, 224", in the boss 224, the valve, 228, opening of flow from the chamber into the duct, 224*, and seating against reverse flow.

In the drawings this pumping device as a whole is shown connected for supplying fuel to the governed level fuel chamber of an engine carbureter, said governed level fuel chamber being indicated at 100 in Figures 2 and 6; and the connection for inflow from the liquid source and discharge to said governed level chamber may be understood from Figure 2, as will now be described, the inflow from the liquid source being by a pipe, 101, through a strainer, 102, past a check valve,

103, to a pipe, 104, extending upwardly in the chamber, 100, said pipe having connection at 105 with the duct, 222", which leads to the inflow check valve, 226, and having connection by way of a check valve, 107, with the flow passage, 206", of the core member, 206.

The pipe, 104, discharges at its upper end, as seen at 109, in the upper part'of the chamber, 100, said discharge being controlled against backflow by a check valve, 110; and the duct, 224", also discharges into the upper part of the chamber, 100, as seen at 111, backflow being prevented by the check valve, 228, already described.

I claim:

1. In an electromagnetic pumping apparatus, in combination with a pump cylinder and piston therein, an electromagnetic device comprising a fixed core of magnetizable metal, electric circuit windings encompassing said core for magnetizing the same when the windings are electrically energized; a switch device for connecting said windings with the source of current, the pump cylinder and piston being axially aligned with the electromagnet core and windings, the piston being of metal suitable to cooperate as an armature with the fixed core of the electromagnet, and having mechanical connections for operating the switch to open the circuit by its movement responsive to the attraction of the magnet core and to close the circuit by the reverse movement, and a spring reacting on the armature piston to cause such reverse movement.

2. In the construction defined in claim 1, the pump cylinder being extended from one end of the magnetizable core, and the circuit windings being extended 'to encompass said cylinder continuously with the windings about the core.

3. In combination with the construction defined in claim 1, a casing in which the electromagnetic device is contained having a chamber at the part thereof in which the pump cylinder is located, said chamber having a liquid inlet and outlet and check valves controlling the same for inflow and outflow respectively, and seating against reverse flow.

4. In the construction defined in claim 1, the pump cylinder being joined fluid-tight to the magnetizable core, and said core having an aperture extending longitudinally through it for alfording fluid inlet and outlet to the pump cylinder in the reciprocation of the armature piston, whereb adapted to be connected or pumping at the side of the magnet core opposite that at which the cylinder and piston are located.

5. In combination with the construction defined in claim 1, a casing in which the electromagnetic device is contained having a chamber at the end at which the cylinder and piston are located, said chamber having liquid inlet and outlet connections and check valves controlling said inlet and outlet openings for the structure is "in hand at inflow and outflow respectively, and seating against reverse flow, the pump cylinder member being joined liquid-tight to the magnetizable core, and said core having an a erture from end to end to afi'ord fluid i and outflow to the cylinder responsive" to the reciprocation of the piston therein, whereby the structure is adapted for pumping connection at the end opposite the cylinder and piston and thereby becomes a double-actmg pump.

In test1mon' whereof, I have hereunto set hicago, Illinois, this 13thday July, 1931.

PERGIVAL S. TICE. 

